No, he's saying that the S-Video and Composite video inputs share the same audio inputs.

As for the Slingbox Pro-HD, mine has active profiles for Composite, Component, S-Video, and ANT IN. So, its not a problem with the design of the Slingbox. However, it sounds like you might be having problems with either the hardware or software.

If the problem continues to presist, please tell us what happens during the setup process of the respective video source. Its important to understand what happens during the Setup Assistant; like if you're able to see a picture, able to shut off the set-top box, and if it the process completes normally or if you're given any types of warnings during the process.